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 * Copyright (c) 2012, Google Inc. All rights reserved.
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 * modification, are permitted provided that the following conditions are
 * met:
 *
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 * notice, this list of conditions and the following disclaimer.
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 * in the documentation and/or other materials provided with the
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 * this software without specific prior written permission.
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#ifndef SKY_ENGINE_PLATFORM_GEOMETRY_LAYOUTRECT_H_
#define SKY_ENGINE_PLATFORM_GEOMETRY_LAYOUTRECT_H_

#include "flutter/sky/engine/platform/geometry/IntRect.h"
#include "flutter/sky/engine/platform/geometry/LayoutBoxExtent.h"
#include "flutter/sky/engine/platform/geometry/LayoutPoint.h"
#include "flutter/sky/engine/wtf/Vector.h"

namespace blink {

class FloatRect;

class PLATFORM_EXPORT LayoutRect {
 public:
  LayoutRect() {}
  LayoutRect(const LayoutPoint& location, const LayoutSize& size)
      : m_location(location), m_size(size) {}
  LayoutRect(LayoutUnit x, LayoutUnit y, LayoutUnit width, LayoutUnit height)
      : m_location(LayoutPoint(x, y)), m_size(LayoutSize(width, height)) {}
  LayoutRect(const FloatPoint& location, const FloatSize& size)
      : m_location(location), m_size(size) {}
  LayoutRect(const IntRect& rect)
      : m_location(rect.location()), m_size(rect.size()) {}

  explicit LayoutRect(
      const FloatRect&);  // don't do this implicitly since it's lossy

  LayoutPoint location() const { return m_location; }
  LayoutSize size() const { return m_size; }

  IntPoint pixelSnappedLocation() const { return roundedIntPoint(m_location); }
  IntSize pixelSnappedSize() const {
    return IntSize(snapSizeToPixel(m_size.width(), m_location.x()),
                   snapSizeToPixel(m_size.height(), m_location.y()));
  }

  void setLocation(const LayoutPoint& location) { m_location = location; }
  void setSize(const LayoutSize& size) { m_size = size; }

  ALWAYS_INLINE LayoutUnit x() const { return m_location.x(); }
  ALWAYS_INLINE LayoutUnit y() const { return m_location.y(); }
  ALWAYS_INLINE LayoutUnit maxX() const { return x() + width(); }
  ALWAYS_INLINE LayoutUnit maxY() const { return y() + height(); }
  LayoutUnit width() const { return m_size.width(); }
  LayoutUnit height() const { return m_size.height(); }

  int pixelSnappedX() const { return x().round(); }
  int pixelSnappedY() const { return y().round(); }
  int pixelSnappedWidth() const { return snapSizeToPixel(width(), x()); }
  int pixelSnappedHeight() const { return snapSizeToPixel(height(), y()); }
  int pixelSnappedMaxX() const {
    return (m_location.x() + m_size.width()).round();
  }
  int pixelSnappedMaxY() const {
    return (m_location.y() + m_size.height()).round();
  }

  void setX(LayoutUnit x) { m_location.setX(x); }
  void setY(LayoutUnit y) { m_location.setY(y); }
  void setWidth(LayoutUnit width) { m_size.setWidth(width); }
  void setHeight(LayoutUnit height) { m_size.setHeight(height); }

  ALWAYS_INLINE bool isEmpty() const { return m_size.isEmpty(); }

  // NOTE: The result is rounded to integer values, and thus may be not the
  // exact center point.
  LayoutPoint center() const {
    return LayoutPoint(x() + width() / 2, y() + height() / 2);
  }

  void move(const LayoutSize& size) { m_location += size; }
  void moveBy(const LayoutPoint& offset) {
    m_location.move(offset.x(), offset.y());
  }
  void move(LayoutUnit dx, LayoutUnit dy) { m_location.move(dx, dy); }

  void expand(const LayoutSize& size) { m_size += size; }
  void expand(const LayoutBoxExtent& box) {
    m_location.move(-box.left(), -box.top());
    m_size.expand(box.left() + box.right(), box.top() + box.bottom());
  }
  void expand(LayoutUnit dw, LayoutUnit dh) { m_size.expand(dw, dh); }
  void contract(const LayoutSize& size) { m_size -= size; }
  void contract(const LayoutBoxExtent& box) {
    m_location.move(box.left(), box.top());
    m_size.shrink(box.left() + box.right(), box.top() + box.bottom());
  }
  void contract(LayoutUnit dw, LayoutUnit dh) { m_size.expand(-dw, -dh); }

  void shiftXEdgeTo(LayoutUnit edge) {
    LayoutUnit delta = edge - x();
    setX(edge);
    setWidth(std::max<LayoutUnit>(0, width() - delta));
  }
  void shiftMaxXEdgeTo(LayoutUnit edge) {
    LayoutUnit delta = edge - maxX();
    setWidth(std::max<LayoutUnit>(0, width() + delta));
  }
  void shiftYEdgeTo(LayoutUnit edge) {
    LayoutUnit delta = edge - y();
    setY(edge);
    setHeight(std::max<LayoutUnit>(0, height() - delta));
  }
  void shiftMaxYEdgeTo(LayoutUnit edge) {
    LayoutUnit delta = edge - maxY();
    setHeight(std::max<LayoutUnit>(0, height() + delta));
  }

  LayoutPoint minXMinYCorner() const {
    return m_location;
  }  // typically topLeft
  LayoutPoint maxXMinYCorner() const {
    return LayoutPoint(m_location.x() + m_size.width(), m_location.y());
  }  // typically topRight
  LayoutPoint minXMaxYCorner() const {
    return LayoutPoint(m_location.x(), m_location.y() + m_size.height());
  }  // typically bottomLeft
  LayoutPoint maxXMaxYCorner() const {
    return LayoutPoint(m_location.x() + m_size.width(),
                       m_location.y() + m_size.height());
  }  // typically bottomRight

  bool intersects(const LayoutRect&) const;
  bool contains(const LayoutRect&) const;

  // This checks to see if the rect contains x,y in the traditional sense.
  // Equivalent to checking if the rect contains a 1x1 rect below and to the
  // right of (px,py).
  bool contains(LayoutUnit px, LayoutUnit py) const {
    return px >= x() && px < maxX() && py >= y() && py < maxY();
  }
  bool contains(const LayoutPoint& point) const {
    return contains(point.x(), point.y());
  }

  void intersect(const LayoutRect&);
  void unite(const LayoutRect&);
  void uniteIfNonZero(const LayoutRect&);

  void inflateX(LayoutUnit dx) {
    m_location.setX(m_location.x() - dx);
    m_size.setWidth(m_size.width() + dx + dx);
  }
  void inflateY(LayoutUnit dy) {
    m_location.setY(m_location.y() - dy);
    m_size.setHeight(m_size.height() + dy + dy);
  }
  void inflate(LayoutUnit d) {
    inflateX(d);
    inflateY(d);
  }
  void scale(float s);
  void scale(float xAxisScale, float yAxisScale);

  LayoutRect transposedRect() const {
    return LayoutRect(m_location.transposedPoint(), m_size.transposedSize());
  }

  static LayoutRect infiniteRect() {
    // Return a rect that is slightly smaller than the true max rect to allow
    // pixelSnapping to round up to the nearest IntRect without overflowing.
    return LayoutRect(LayoutUnit::nearlyMin() / 2, LayoutUnit::nearlyMin() / 2,
                      LayoutUnit::nearlyMax(), LayoutUnit::nearlyMax());
  }

#ifndef NDEBUG
  // Prints the rect to the screen.
  void show(bool showRawValue = false) const;
#endif

 private:
  LayoutPoint m_location;
  LayoutSize m_size;
};

inline LayoutRect intersection(const LayoutRect& a, const LayoutRect& b) {
  LayoutRect c = a;
  c.intersect(b);
  return c;
}

inline LayoutRect unionRect(const LayoutRect& a, const LayoutRect& b) {
  LayoutRect c = a;
  c.unite(b);
  return c;
}

PLATFORM_EXPORT LayoutRect unionRect(const Vector<LayoutRect>&);

ALWAYS_INLINE bool operator==(const LayoutRect& a, const LayoutRect& b) {
  return a.location() == b.location() && a.size() == b.size();
}

inline bool operator!=(const LayoutRect& a, const LayoutRect& b) {
  return a.location() != b.location() || a.size() != b.size();
}

inline IntRect pixelSnappedIntRect(const LayoutRect& rect) {
  return IntRect(roundedIntPoint(rect.location()),
                 IntSize(snapSizeToPixel(rect.width(), rect.x()),
                         snapSizeToPixel(rect.height(), rect.y())));
}

PLATFORM_EXPORT IntRect enclosingIntRect(const LayoutRect&);
PLATFORM_EXPORT LayoutRect enclosingLayoutRect(const FloatRect&);

inline IntRect pixelSnappedIntRect(LayoutUnit left,
                                   LayoutUnit top,
                                   LayoutUnit width,
                                   LayoutUnit height) {
  return IntRect(left.round(), top.round(), snapSizeToPixel(width, left),
                 snapSizeToPixel(height, top));
}

inline IntRect pixelSnappedIntRectFromEdges(LayoutUnit left,
                                            LayoutUnit top,
                                            LayoutUnit right,
                                            LayoutUnit bottom) {
  return IntRect(left.round(), top.round(), snapSizeToPixel(right - left, left),
                 snapSizeToPixel(bottom - top, top));
}

inline IntRect pixelSnappedIntRect(LayoutPoint location, LayoutSize size) {
  return IntRect(roundedIntPoint(location),
                 pixelSnappedIntSize(size, location));
}

}  // namespace blink

#endif  // SKY_ENGINE_PLATFORM_GEOMETRY_LAYOUTRECT_H_
